Looking at the horoscope of your brother we see that he is in the Mahadasha of Venus and the antardasha of Saturn. Jupiter rules the 7th house and it is likely to delay marriage or not bring in the desired results. Jupiter in your brothers horoscopes forms the Kendradhipati dosha. Delay in results will be there in his life. Having said that the chances of marriage are very much in second half of 2016.